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14
The nearest Mathematica has to "types" are Heads of expressions that are Atoms. For example:
Through[{AtomQ, Head}[2]]
{True, Integer}
Through[{AtomQ, Head}[2 + I]]
{True, Complex}
Through[{AtomQ, Head}["cat"]]
{True, String}
and so on...
There are also somewhat different "types" in the context of Compile.
10
In Mathematica, the type of a built-in object is represented by the Head. For example, Head[3] is Integer, Head[1.5] is Real and Head[a] is Symbol (assuming that a hasn't been assigned a value, of course, because in that case, you'll get the Head of that value).
Note that for expressions of the form foo[bar,baz], the head is foo. Most expressions are ...
2
In Mathematica, values are expressions.
Types in computer science are collections of values.
Perhaps a type in Mathematica could be viewed as a pattern which matches a certain class of expressions.
Programming language designers often classify values according to the different roles that different types of values are allowed to play in that language. For ...
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